贵刊今年第4期上郭庆荣同志“对平键联接设计的一点建议”一文,我认为很有实用价值,对启发工程技术人员正确灵活地处理工艺与结构的关系很有帮助。经过推导和计算,对该文补充如下。该文主要认为在阶梯轴中,大小直径D_2和D_1处可以采用相同的键槽尺寸。从两者的等强度观点出发,由:σiv=2Mn/Dkl得:D_2k_2l_2 On the 4th issue of your magazine, Comrade Guo Qingrong’s “Some Suggestions on the Design of Flat-key Coupling” is of great practical value. It is very helpful to inspiring engineering and technical personnel to handle the relationship between technology and structure correctly and flexibly. After deduction and calculation, the text is supplemented as follows. This paper mainly considers that in the stepped shaft, the same keyway size can be adopted at the diameter D_2 and D_1. From the perspective of equal strength of the two, from: σiv = 2Mn / Dkl: D_2k_2l_2